chore: Visitors' messages are being counted as agents' responses in livechat metrics

[matheusbsilva137]

Proposed changes (including videos or screenshots)

• Stop considering visitors' messages when building livechat metrics. Only agents' messages should be considered responses
• Removed getAnalyticsUpdateQueryByRoomId model method since we don't need this shortcut anymore (analyticsData is only defined for agents)

Visitor's messages are never first responses for a room, neither a subsequent response -- so we shouldn't try to update metrics related to these events.

Issue(s)

Steps to test or reproduce

Further comments

Introduced by #32961
Blocking #32846

CORE-645

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.40%. Comparing base (f20be47) to head (c85b2da).
Report is 2 commits behind head on develop.

Additional details and impacted files

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##           develop   #33022      +/-   ##
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- Coverage    59.40%   59.40%   -0.01%     
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  Files         2543     2543              
  Lines        63183    63182       -1     
  Branches     14220    14220              
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- Hits         37533    37532       -1     
  Misses       22934    22934              
  Partials      2716     2716              

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